Welcome to the Water Treatment Operator 50 Question Practice Test.
Choose the best possible answer to the question.
1.
When it is dissolved in water for disinfection purposes, how long does ozone last?
2.
For lime-soda ash softening plants, what is the most economical sludge disposal method?
3.
Direct filtration eliminates what conventional treatment step?
4.
How often should the fluoride concentration be measured in treated water?
5.
A 50% solution of caustic soda will begin to crystallize if the temperature drops below?
6.
The chemical combination for substances in solution so as to cause separation in the insoluble form can be described as?
7.
Filtration rates vary from what of filter surface area?
8.
Bar screens are used to?
9.
What factor is used to express the relative volatility of a substance?
10.
What chemical can be created by certain bacterial organisms and accelerate the corrosion process?
11.
Free chlorine residual values are based on contact time of at least?
12.
What is a common mistake operators make in regards to flocculation is excessive flocculation time.
13.
Organic chemistry is concerned with compounds containing what element?
14.
Chlorine is chosen over chloramines because chlorine?
15.
If there is a notification of a HazMat spill of an unknown chemical into a stream that provides water to a water treatment plant, what would be the best action taken?
16.
What is used to prevent water from entering a gas chlorinator?
18.
When entering a permitted confined space entry structure, always complete a permit and?
19.
Where are samples taken for lead and copper?
20.
What form is the protozoan Giardia Lamblia transmitted in?
21.
A surface water treatment plant should have at least how many filtration beds?
22.
What is the optimal pH range for the removal of particulate matter when using Alum as a coagulant?
23.
Why is water softening a part of the water treatment process?
24.
What is the most effective disinfection residual?
25.
What is the main function of a flocculation basin?
26.
What would be best to use for corrosion inhibition if the water is very low in alkalinity and calcium concentration?
27.
What will cause reverse osmosis membranes to compact faster?
28.
If the chlorine demand suddenly increases from 0.4 mg/L to 2.8 mg/L, what could be the reason?
29.
What agency should be called for actual hands on assistance if a substantial chlorine leak incident occurs?
30.
What is the usual effective pH range of iron salt coagulants?
31.
Salts, Bases, and Acids lacking carbon are organic compounds.
32.
Under the Surface Water Treatment Rule a multiple barrier treatment consists of
33.
If there is debris found in the filter bed after backwashing a filter this can indicate?
34.
What angle should the parallel inclined plates be installed when using the shallow depth sedimentation method?
35.
If the water temperature decreases this will cause the disinfection action of chlorine to?
36.
In a conventional treatment plant, primary coagulant compounds added to water during the falsh-mix step are?
37.
What is the most advantageous application point for powdered activated carbon?
38.
The more hydrogen ions
39.
When 0.3 mg/L chlorine is added to water, the residual will increase by 0.3 mg/L.
40.
Coagulation occurs during the first
41.
What chemical can be added to the water system to sequester Iron and Manganese?
42.
How does Groundwater differ from Surface water sources?
43.
What is the main problem if particle agglomeration is occurring in a filter for iron and manganese removal at the interface of the coal layer below?
44.
What is a major cause of short circuiting in a sedimentation basin?
45.
As CaCO3 how much alkalinity will dry-basis alum consume?
46.
River water is not uniform in quality from hour to hour or day to day.
47.
Protozoa that must be removed from raw water are?
48.
When a permit is required to enter a confined space, who may sign the permit?
49.
Wet activated carbon will remove what from the air? (In regards to safety)
50.
What is the cause of temporary hardness?
